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【题目】---Are there aliens on other planets? ---Maybe. But no one knows ________.

A. trueB. for certainC. realD. certain

【答案】B

【解析】

句意:——在其他行星上有外星人吗?——可能有。但是没有人确切知道。true真正的,for certain确切,real真实的,certain有把握的。此处修饰动词know,故用介词短语for certain.故选B

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